INSTALLING MULTIPLE GAMES WORKAROUND
BEFORE you install another MAME game, the contents of the MAME4droid folder need to be moved.
Install A File Manager:
For Android 9 and Lower
Move files from Main Storage > MAME4droid
to
Android > data > com.phoenix_retro_games.game_name
1) Launch File Manager. Select Main Storage > MAME4droid. First select a file then all the files in MAME4droid folder (three vertical dots in menu) and then "Move to...”
Select: Main Storage > Android > data
Create new folder: com.phoenix_retro_games.game_name
then press MOVE.
2) Launch Game and Change Rom Path:
OPTION > Settings > General > Change ROMS path > YES
3) Restart Game
4) Upon restart:
Do you want to use default ROMS path? NO
5) Select Rom folder:
Android > data > com.phoenix_retro_games.game_name > roms > DONE
To install NEW Game
A) Delete MAME4droid folder (Launch file manager: Main Storage > MAME4droid)
B) NOW Install New Game (will ask to use default ROMs path -> YES)
C) To install additional new games repeat the above process -> (1) and then install the new game.
For Android 10 and above (with scoped storage)
When the game is launched for the first time choose:
1) Select NEW WAY (with scoped storage - recommended)
or
2) Select OLD WAY and manage files as above ie for Android 9 and lower